Готові списки джерел за темами / Enamel-A

Добірка наукової літератури з теми "Enamel-A"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Enamel-A"

1

Ryabova, Anna V., Anna Yu Fanda, and Sergey V. Trofimov. "Functional Protective Coatings for Steel Architectural Construction Panels." MATEC Web of Conferences 346 (2021): 02041. http://dx.doi.org/10.1051/matecconf/202134602041.

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Currently, enameled steel products are becoming very popular in construction, since they have a number of valuable properties that noticeably distinguish enameled architectural and construction panels against the background of other facing building materials. Also, extremely urgent is the problem of obtaining glass enamel coatings for architectural and construction panels with high properties. In the work, glass-crystalline enamel coatings in the system R2O–RO–B2O3–Al2O3–SiO2–TiO2–P2O2–F- were studied, the features of their formation on facing steel panels were revealed. The physicochemical and aesthetic-consumer properties of the developed enamel coatings have been investigated. The influence of the chemical composition of titanium-containing glass and the crystallization process on the whiteness index of white coating glass-crystalline enamels and the characteristic color shade was studied using a spectrophotometric method using an RGB color measurement model. This method made it possible to accurately determine the shades of the obtained glass-crystalline enamel coatings for steel.
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2

Lebedeva, Tat’yana V., and Sergey I. Galanin. "DECORATING ENAMEL INSERTS WITH ENAMEL GRANULATION." Technologies & Quality 52, no. 2 (July 2, 2021): 62–67. http://dx.doi.org/10.34216/2587-6147-2021-2-52-62-67.

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The results of an experimental study of the combined enamelling technique are presented – enamel with enamel granulation. Original enamel inserts, decorated with enamel granules of various colours and sizes, were obtained, the use of which expands the possibilities of decorative enamelling. It is shown that different degrees of fusion of the enamel grain on the prepared base gives different artistic effects. Spherical grains, qualitatively adhered to the enamel ground, give a more explicit, spectacular relief; focus on specific elements of the pictorial composition. Melted hemispherical grains give a light texture to the composition, support and complement the enamel painting. Recommendations are given on the formation of granulation, preparation of enamel soil, drawing of details, firing temperatures of enamels to obtain high-quality granulation and colourful artistic composition, as well as other technological and design aspects of the decorating process.
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3

Seto, Tsz Ho, Anastasiia Grymak, Vidya Mudliar, and Joanne Jung Eun Choi. "Effect of Enamel Bleaching on the Bond Strength of Ceramic—A Systematic Review." Oral 2, no. 2 (June 15, 2022): 182–97. http://dx.doi.org/10.3390/oral2020018.

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The increase in aesthetic demands has increased the use of ceramic dental restorations in dentistry. Ceramic restorations are bonded to the tooth structure using adhesives. There is a lack of standard guidelines in terms of post-bleaching time intervals and bond strengths of ceramic restorations. Bleaching products have also been stated to affect the morphology of enamel. Therefore, the purpose of this systematic review is to evaluate the bond strength between ceramic and enamel and the changes in the surface roughness of enamel post teeth bleaching. An electronic search was performed in the databases PubMed, OVID MEDLINE, Scopus, and Web of Science with MESH terms: “adhesion OR bonding”, “ceramic OR ceramics OR dental porcelain”, “tooth bleaching OR teeth bleaching OR tooth whitening OR teeth whitening” and “enamel OR dental enamel OR enamels OR dental enamels”. The articles were screened, and the final selection of articles was obtained by using the inclusion and exclusion criteria. Of the 170 studies identified from the search, only 12 studies met the inclusion criteria and were selected for full-text review. A further search by hand was performed, and additional 48 studies were selected. From the 60 full-text studies, 18 studies met the inclusion criteria and were included for data extraction. The results were based on a descriptive analysis of the effect on bond strength of ceramic to enamel after a bleaching protocol and the changes in the surface roughness of enamel post bleaching protocol. In conclusion, bleaching protocols alter the surface roughness of enamel and, thus, the shear bond strength between ceramic and enamel. Bleaching treatments with a higher concentration of hydrogen peroxide reduce the bond strength between ceramic and enamel. Delaying bonding after bleaching for up to 7 days increases the bond strength between ceramic and enamel.
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4

Limeback, H. "Isolation and characterization of pig enamelins." Biochemical Journal 243, no. 2 (April 15, 1987): 385–90. http://dx.doi.org/10.1042/bj2430385.

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Enamel proteins were extracted from pig developing enamel by sequential extraction procedures. Two proteins identified as enamelins by slab-gel electrophoresis (Mr 67,000 and 63,000) were separated from amelogenins by gel sieving and ion-exchange chromatography. Their enamelin characteristic was confirmed by hydroxyapatite-binding studies and amino acid analysis. Degradation of extracted enamel proteins was also studied in vitro. The larger of the two enamelins appeared to be resistant to degradation by endogenous enamel proteinases. Hydroxyapatite showed strong binding with the enamelins, but did not prevent the degradation of the Mr-63,000 enamelin. These results indicate that at least one high-Mr enamelin in pig developing enamel is a source of enamelin breakdown products.
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5

Kim, J. W., F. Seymen, B. P. J. Lin, B. Kiziltan, K. Gencay, J. P. Simmer, and J. C. C. Hu. "ENAM Mutations in Autosomal-dominant Amelogenesis Imperfecta." Journal of Dental Research 84, no. 3 (March 2005): 278–82. http://dx.doi.org/10.1177/154405910508400314.

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To date, 4 unique enamelin gene (ENAM) defects have been identified in kindreds with amelogenesis imperfecta. To improve our understanding of the roles of enamelin in normal enamel formation, and to gain information related to possible genotype/phenotype correlations, we have identified 2 ENAM mutations in kindreds with hypoplastic ADAI, 1 novel (g.4806A>C, IVS6-2A>C) and 1 previously identified (g.8344delG), and have characterized the resulting enamel phenotypes. The IVS6-2A>C mutation caused a severe enamel phenotype in the proband, exhibiting horizontal grooves of severely hypoplastic enamel. The affected mother had several shallow hypoplastic horizontal grooves in the lower anterior teeth. In the case of the g.8344delG mutation, the phenotype was generalized hypoplastic enamel with shallow horizontal grooves in the middle 1/3 of the anterior teeth. In general, mutations in the human enamelin gene cause hypoplastic enamel, often with horizontal grooves, but the severity of the enamel defects is variable, even among individuals with the same mutation.
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6

Nagano, T., S. Oida, H. Ando, K. Gomi, T. Arai, and M. Fukae. "Relative Levels of mRNA Encoding Enamel Proteins in Enamel Organ Epithelia and Odontoblasts." Journal of Dental Research 82, no. 12 (December 2003): 982–86. http://dx.doi.org/10.1177/154405910308201209.

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Amelogenin, enamelin, sheathlin (ameloblastin/ amelin), enamelysin (MMP-20), and KLK4 (EMSP-1) are the major structural proteins and proteinases in developing tooth enamel. Recently, odontoblasts were reported to express amelogenin, the most abundant enamel protein. In this study, we hypothesized that odontoblasts express all enamel proteins and proteases, and we measured their relative mRNA levels in enamel organ epithelia and odontoblasts associated with porcine secretory- and maturation-stage enamel by RT-PCR, using a LightCycler instrument. The results showed that amelogenin mRNA in secretory-stage EOE is 320-fold higher than in odontoblasts beneath secretory-stage enamel, and over 20,000-fold higher than in odontoblasts under maturation-stage enamel. Similar results were obtained for enamelin and sheathlin. Enamelysin mRNA levels were equivalent in these two tissues, while KLK4 mRNA was higher in odontoblasts than in secretory-stage EOE. These results support the conclusion that odontoblasts are involved in the formation of the enamel layer adjacent to enamel-dentin junction.
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7

Farooq, Imran, and Amr Bugshan. "The role of salivary contents and modern technologies in the remineralization of dental enamel: a review." F1000Research 9 (March 9, 2020): 171. http://dx.doi.org/10.12688/f1000research.22499.1.

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Анотація:
Human enamel once formed cannot be biologically repaired or replaced. Saliva has a significant role in remineralization of dental enamel. It not only has a buffering capacity to neutralize the oral cavity’s low pH generated after acidic encounters, but also acts as a carrier of essential ions, such as fluoride, calcium and phosphate, which have a positive role in enamel’s remineralization. This review discusses how salivary contents, like proteins and enzymes, have a natural role in enamel’s mineralization. In addition, the presence of ions, such as fluoride, calcium and phosphate, in saliva further enhances its capability to remineralize the demineralized enamel surface. The review further examines modern innovative technologies, based on biomimetic regeneration systems, including dentin phosphoproteins, aspartate-serine-serine, recombinant porcine amelogenin, leucine-rich amelogenin peptide and nano-hydroxyapatite, that promote enamel remineralization. Fluoride boosters like calcium phosphates, polyphosphates, and certain natural products can also play an important role in enamel remineralization.
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8

Farooq, Imran, and Amr Bugshan. "The role of salivary contents and modern technologies in the remineralization of dental enamel: a narrative review." F1000Research 9 (June 15, 2021): 171. http://dx.doi.org/10.12688/f1000research.22499.3.

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Анотація:
Human enamel once formed cannot be biologically repaired or replaced. Saliva has a significant role in remineralization of dental enamel. It not only has a buffering capacity to neutralize the oral cavity’s low pH generated after acidic encounters, but also acts as a carrier of essential ions, such as fluoride, calcium and phosphate, which have a positive role in enamel’s remineralization. This review discusses how salivary contents, like proteins and enzymes, have a natural role in enamel’s mineralization. In addition, the presence of ions, such as fluoride, calcium and phosphate, in saliva further enhances its capability to remineralize the demineralized enamel surface. The review further examines modern innovative technologies, based on biomimetic regeneration systems, including dentin phosphoproteins, aspartate-serine-serine, recombinant porcine amelogenin, leucine-rich amelogenin peptide and nano-hydroxyapatite, that promote enamel remineralization. Fluoride boosters like calcium phosphates, polyphosphates, and certain natural products can also play an important role in enamel remineralization.
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9

Farooq, Imran, and Amr Bugshan. "The role of salivary contents and modern technologies in the remineralization of dental enamel: a narrative review." F1000Research 9 (April 1, 2020): 171. http://dx.doi.org/10.12688/f1000research.22499.2.

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Анотація:
Human enamel once formed cannot be biologically repaired or replaced. Saliva has a significant role in remineralization of dental enamel. It not only has a buffering capacity to neutralize the oral cavity’s low pH generated after acidic encounters, but also acts as a carrier of essential ions, such as fluoride, calcium and phosphate, which have a positive role in enamel’s remineralization. This review discusses how salivary contents, like proteins and enzymes, have a natural role in enamel’s mineralization. In addition, the presence of ions, such as fluoride, calcium and phosphate, in saliva further enhances its capability to remineralize the demineralized enamel surface. The review further examines modern innovative technologies, based on biomimetic regeneration systems, including dentin phosphoproteins, aspartate-serine-serine, recombinant porcine amelogenin, leucine-rich amelogenin peptide and nano-hydroxyapatite, that promote enamel remineralization. Fluoride boosters like calcium phosphates, polyphosphates, and certain natural products can also play an important role in enamel remineralization.
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10

Koenigswald von, Wighart, and Francisco Goin. "Enamel differentiation in South American marsupials and a comparison of placental and marsupial enamel." Palaeontographica Abteilung A 255, no. 4-6 (January 31, 2000): 129–68. http://dx.doi.org/10.1127/pala/255/2000/129.

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Дисертації з теми "Enamel-A"

1

McKee, Marc Douglas. "A morphological and functional investigation of the enamel organ and enamel in the rat incisor /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75424.

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Анотація:
A morphological and functional investigation of the enamel organ and enamel was carried out on the incisor of the rat. Using transmission electron microscopy and other electron optical techniques, the ultrastructure of enamel hydroxyapatite crystallites and the morphology of the cells of the enamel organ related to these crystallites were examined. In the enamel secretion zone, putative cell communication via matched approaches of rough endoplasmic reticulum to the ameloblast cell membrane was not confirmed. Throughout the enamel organ, extracellular permeability was assessed using radiolabeled proteins as tracers. Regional differences were found, especially related to the two types of maturation ameloblasts. Several modified histochemical techniques were successfully applied to the enamel such that the functional contribution of each type of ameloblast was ascertained. In this way it was demonstrated that several functional cell subpopulations exist and that they can be correlated with different calcium and protein distributions within the enamel. In vivo injection of vinblastine, and in vitro treatments with other drugs, all severely modified the enamel maturation staining pattern and $ sp{45}$Ca uptake. In addition, it was found that ruffle-ended maturation zone ameloblasts possess higher levels of specific transferrin receptor sites relative to smooth-ended ameloblasts, a finding that may be directly related to the deposition of iron within the enamel.
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2

Hall, Nathan E. "A Radiographic Analysis of Variance in Lower Incisor Enamel Thickness." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/887.

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The purpose of this study was to help predict the enamel thickness of mandibular incisors. At least two direct digital periapical radiographs were made for each of the 80 subjects. Radiographs were scaled to control for magnification errors using dental study models and computer software. Mesiodistal incisor width and mesial and distal enamel thicknesses were measured. Lateral incisors were determined to be wider than central incisors and distal enamel thicknesses were larger than mesial enamel thicknesses on average. The African American group demonstrated wider incisors and enamel thicknesses than the Caucasian group on average. Enamel thickness positively correlated with tooth width for all incisors. No statistically significant differences were detected between male and female groups. Some conclusions relating to enamel thickness can be made based on race, incisor position, and incisor width, but correlations were not considered strong enough to accurately determine enamel width, without the aid of radiographs.
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3

Robinson, Bruce William. "A morphological study of the formation of the dentino-enamel junction in the rat molar : the role of dentin in enamel formation." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27630.

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This thesis is a morphological study detailing the initial formation of the dentino-enamel junction (DEJ) in the rat molar. It was undertaken to determine how enamel apatite crystals are initiated during tooth development. The DEJ was investigated along its developmental gradient so that both the spatial and temporal sequences of dentin and enamel mineralization could be observed. For this investigation both conventional and selected-area dark-field electron microscopy were applied. The results of this study indicate that enamel crystals arise by epitaxial growth from preformed dentin crystals. This is supported by the temporal relationship beween dentin and enamel where dentin mineralization preceeds enamel mineralization and the intimate spatial relationship between the apatite crystals of dentin and enamel at both the newly formed and the more mature dentino-enamel junction. These results also suggest that the terminal portions of collagen fibrils in the pre-dentin matrix undergo some alteration prior to mineralization which may be related to their function in presenting dentin apatite to the enamel matrix. The interrelatonship between both the inorganic and organic matrices of dentin and enamel are presented in a working model and discussed in light of the mechanisms by which mineralized dentin may promote the formation of enamel crystals.
Medicine, Faculty of
Graduate
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4

Moeinian, Malihe. "Development of a radiopaque infiltration resin for early enamel carious lesion." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/36694.

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A white spot lesion (WSL) is defined as enamel porosity, which could be due to an enamel defect or an initial carious lesion. ICON® resin is a resin infiltrant that penetrates into the enamel porosity and seals the lesion, thus inhibiting the progression of caries. This method is micro-invasive; however, the resin is radiolucent and the clinician cannot detect the material using radiographs. In order to develop a radiopaque resin, understanding the pore size and pore structure in WSLs is helpful. Therefore, the aim of this study was to characterise: (1) the pore size and structure, (2) the incorporation of radiopaque agents into ICON® resin. Brunauer-Emmett-Teller (BET) and focused ion beam-scanning electron microscopy (FIB-SEM) were used to characterise the porosity in WSLs. The data showed the enamel prisms become more pronounced in the advanced areas of the WSLs and demineralisation occurs within or/and between the enamel prisms. The pore size could be as small as an enamel crystallite, 28x48nm. Nano-strontium hydroxyapatite (non-coated and coated) and strontium bioglass were made as radiopaque fillers and characterised using different techniques including fourier transform infrared spectroscopy (FTIR), BET, transmission electron microscopy (TEM), X-ray diffraction (XRD) and particle size measurements. The radiopaque fillers had micron-sized particles, which made them unsuitable for infiltration into WSLs despite their possible ability to remineralise the WSLs. Radiopaque monomers including bromine-methacrylate and tin-methacrylate were able to make ICON® resin radiopaque and they showed a similar viscosity, wettability and biocompatibility compared to ICON® resin. The X-ray microtomography (XMT) showed that the experimental radiopaque resins were able to infiltrate into the WSLs, artificial and natural lesions, and they could be detected using image subtraction. Backscattered electron (BSE) imaging after each step of application of materials showed that the etching pattern and etchant gel could be barriers for a successful infiltration of the resins into WSLs.
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5

Abdellatif, Abeer Moustafa. "A study of developmental defects of enamel using clinical indices and image analysis." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247151.

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6

Al-Mosawi, Mohammed. "Towards a 4-D spatial and temporal model of human enamel biomineralisation." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/41764.

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Precise timings and spatial progression of human enamel biomineralisation are still largely unknown due to scarcity of developing human enamel specimens available for investigation. This information is crucial for optimising emerging biomimetic regenerative and reparative dentistry routes. Five developing permanent incisors were obtained from an archaeological source and used alongside mature contemporary teeth for comparison. X-ray microtomography (XMT), synchrotron X-ray diffraction (S-XRD) and quantitative back-scattered electrons (qBSE) imaging were used to investigate the mineral density distribution, the crystallites texture magnitude and orientation and the nanostructure of dental enamel at various developmental stages, respectively. XMT revealed that there was a bi-directional mineralisation "front" that starts at the cusp tip and at the enamel-dentine junction (EDJ) travelling cervically and peripherally until the relative mineral density is uniform in the fully mature tooth (2.75 g/cm3 ± 0.01 g/cm3). S-XRD revealed that within one probed region, two populations of crystallite orientations exist simultaneously with an angular separation of 20-50°, with one population being more dominant than the other by a factor of approximately 3:7. Furthermore, one population displayed a higher degree of crystallite texture than the other. These phenomena were observed in all stages of tooth development. The crystallites in both populations were oriented approximately perpendicular to the EDJ regardless of development stage, indicating initial preferred directions of crystallites persist from early through to full maturation. The direction and magnitude of organisation within two distinct populations of crystallites within the developing and mature enamel has not been quantified previously. qBSE analyses suggested that the two observed populations are most likely due to prism decussation and revealed that mineralisation of prism cores precedes that of prism boundaries. These results provide new insights towards building a quantitative spatio-temporal model of human enamel biomineralisation in order to inform emerging biomimetic reparative/regenerative dental technologies.
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7

Chatfield, Stuart R. "A study of pore structure of human dental enamel using radiotracer techniques." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389134.

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8

Al, Kawas Sausan. "A comparative study of maturation processes in enamel and bone in the rat." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ36951.pdf.

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9

Baxter, Richard Turner. "Using Digital Microscopy to Evaluate Enamel Defects in Young Children: A Novel Method." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1403188806.

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10

Bechtle, Sabine [Verfasser]. "On the mechanical properties of dental enamel - A multi-scale approach - / Sabine Bechtle." München : Verlag Dr. Hut, 2011. http://d-nb.info/1014848709/34.

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Книги з теми "Enamel-A"

1

Posluns, James. Enamel decalcification in orthodontics: A survey of Canadian orthodontists. [Toronto: University of Toronto, Faculty of Dentistry], 1998.

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2

Colour atlas of a new concept of enamel caries. London: L.K. Bandlish, 1987.

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3

Torch-fired enamel jewelry: A workshop in painting with fire. Cincinnati, Ohio: North Light, 2011.

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4

Tudor, Jean E. Vitreous enamels: A bibliography of processes, objects, and enamelists. [Indianapolis, Ind.]: J. Tudor, 1994.

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5

Marthe, Le Van, ed. 500 enameled objects: A celebration of color on metal. New York: Lark Books, 2009.

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6

Turkington, Marie. Development of a sputter deposited calcium phosphate thin film for use as a model dental enamel surface. [S.l: The author], 2004.

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7

Institute, Porcelain Enamel. 68th Porcelain Enamel Institute Technical Forum: A collection of papers presented at the 68th Porcelain Enamel Institute Technical Forum, May 15-18, 2006, Nashville, Tennessee. Hoboken, N.J: John Wiley & Sons, 2007.

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8

dealer), Andre Ruzhnikov (Art. A collection of Russian icons: Silver, enamels, bronzes and Fabergé. Palo Alto, Calif: A. Ruzhnikov, 1987.

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9

Evans, David John. A study of developmental defects in dental enamel in 10 year old children in South Glamorgan. Birmingham: University of Birmingham, 1989.

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10

Hornstein, Leon. A modern method of creating enameled filigree jewelry: With added instructions for making the wire and the tools. Baltimore, Md: L. Hornstein, 2000.

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Частини книг з теми "Enamel-A"

1

Opp, Dennis. "Maintaining a Reliable WeT Enamel System." In 68th Porcelain Enamel Institute Technical Forum: Ceramic Engineering and Science Proceedings, 185–94. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470291382.ch20.

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2

Hale, Jeff, and Glenn Stribling. "Equipment for a Porcelain Enamel Application." In 60th Porcelain Enamel Institute Technical forum: Ceramic Engineering and Science Proceedings, Volume 19, Issue 5, 107–21. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294512.ch22.

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3

Hale, Jeff. "A Porcelain Enamel Powder Case History." In 61st Porcelain Enamel Institute Technical Forum: Ceramic Engineering and Science Proceedings, Volume 20, Issue 5, 99–103. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294581.ch16.

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4

Brès, E. F., J. Reyes-Gasga, and J. Hemmerlé. "Human Tooth Enamel, a Sophisticated Material." In Extracellular Matrix Biomineralization of Dental Tissue Structures, 243–59. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76283-4_9.

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5

Reece, Robert D. "A View of a Porcelain Enamel Powder Operation." In 60th Porcelain Enamel Institute Technical forum: Ceramic Engineering and Science Proceedings, Volume 19, Issue 5, 99–103. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294512.ch20.

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6

Sellins, Jeffrey. "Another View of a Porcelain Enamel Powder Operation." In 60th Porcelain Enamel Institute Technical forum: Ceramic Engineering and Science Proceedings, Volume 19, Issue 5, 105. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294512.ch21.

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7

Evele, Holger. "Viscosity as a Measure to Control Enamel Application." In 64th Porcelain Enamel Institute Technical Forum: Ceramic Engineering and Science Proceedings, Volume 23, Issue 5, 115–21. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294765.ch15.

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Mann, Stephen. "The Biomimetics of Enamel: A Paradigm for Organized Biomaterials Synthesis." In Ciba Foundation Symposium 205 - Dental Enamel, 261–74. Chichester, UK: John Wiley & Sons, Ltd., 2007. http://dx.doi.org/10.1002/9780470515303.ch18.

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Slavkin, H. C., R. J. Krejsa, A. Fincham, P. Bringas, V. Santos, Y. Sassano, M. L. Snead, and M. Zeichner-David. "Evolution of Enamel Proteins: a Paradigm for Mechanisms of Biomineralizaiton." In Mechanisms and Phylogeny of Mineralization in Biological Systems, 383–89. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68132-8_61.

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Kaluzny, Ken. "Making Porcelain Enamel More Competitive with Stainless Steel: A Holistic Approach to Process Improvement." In Advances in Porcelain Enamel Technology, 91–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470640906.ch17.

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Тези доповідей конференцій з теми "Enamel-A"

1

Chun, Keyoung Jin, Hyun Ho Choi, and Jong Yeop Lee. "A Study of the Mechanical Role of Enamel and Dentin in Human Teeth." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86831.

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Анотація:
The dental hard tissues of a tooth are combined of enamel and dentin together. The enamel protects the dentin and comes in direct contact with food during mastication. Bite force is expressed as compression force. The purpose of this study is to identify the primary roles of enamel and dentin during mastication by analyzing their mechanical properties and hardness. Healthy human teeth (age: 19.3 ± 4.1) were used as specimens for mechanical tests. The teeth, which underwent epoxy resin molding, were machine cut to make 10 enamel specimens, 10 dentin specimens and 10 enamel–dentin composite (ED) specimens of 1.2 mm × 1.2 mm × 3.0 mm (Width × Height × Length) in size. Compression tests were conducted using a micro-load system at 0.1 mm/min test speed. Teeth surface hardness (HV) was measured by a Vickers diamond indenter with a 300g indentation load. Data were obtained from 4 points on each enamel specimen and 4 points on each dentin specimen. The strain (%), stress (MPa) and modulus of elasticity (E, MPa) of the specimens were obtained from compression tests. The MAX. strain of the enamel, dentin and ED specimens were 4.5 ± 0.8 %, 11.9 ± 0.1 % and 8.7 ± 2.7 %, respectively. The MAX. stress of the enamel, dentin and ED specimens were 62.2 ± 23.8 MPa, 193.7 ± 30.6 MPa and 126.1 ± 54.6 MPa, respectively. The E values of the enamel, dentin and ED specimens were 1338.2 ± 307.9 MPa, 1653.7 ± 277.9 MPa and 1628.6 ± 482.7 MPa, respectively. The E of the dentin specimens was the highest and the E of the enamel specimens was the lowest, but the E values of all specimens was not significantly different in the T-test (P > 0.1). The measured hardness value of the enamel specimens (HV = 274.8 ± 18.1) was about 4.2 times higher than that of the dentin specimens (HV = 65.6 ± 3.9). Because of the values of MAX. stress and MAX. strain of the enamel specimens, the enamel specimens tended to fracture earlier than the dentin and ED specimens; therefore, enamel was considered to be more brittle than dentin and ED. Enamel is a harder tissue than dentin based on their measured hardness values. Therefore, enamel has a higher wear resistance, making it suitable for grinding and crushing, whereas dentin has a higher force function, making it suitable for abutment against bite force.
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Dwyer-Joyce, R. S., R. Lewis, and M. Goodman. "Ultrasound as a Tool to Measure the Wear of Human Tooth Enamel." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63499.

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A reliable tool for assessing the extent of human enamel wear would be useful to dental practitioners. Current in-vivo methods for determining tooth wear are largely qualitative in nature or depend on measurements taken from tooth impressions, which is very time consuming. The aim of this work was to investigate the feasibility of using ultrasound to measure enamel thickness with a view to developing an in-vivo tool for enamel wear assessment. Three different ultrasonic techniques were used in-vitro to take measurements of enamel on extracted teeth. The first used a focusing immersion transducer (25 MHz) and a time of flight approach to obtain enamel thickness. The other two techniques used planar contact probes (10 MHz), the first with a time of flight approach and the second with a resonance method to determine enamel thickness. The results were compared with direct measurements of sectioned teeth. All three methods showed good correlation with these measurements. The contact probe technique was the easiest measurement to carry out, which would also be the simplest to implement in a measurement tool. While the resonance measurements obtained were good, the time of flight approach was thought to be most likely to obtain accurate repeatable measurements.
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Chun, Keyoung Jin, Hyun Ho Choi, and Jong Yeop Lee. "A Comparative Study of Mechanical Properties of Tooth Reconstruction Materials." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63106.

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Tooth reconstruction materials are used to reconstruct damaged teeth as well as to recover their functions. In this study, the mechanical properties of various tooth reconstruction materials were determined using test specimens of identical shape and dimension under the same compressive test condition; the hardness values of them were obtained from previous studies and compared with those of enamel and dentin. Amalgam, dental ceramic, dental gold alloy, dental resin, zirconia and titanium were processed as tooth reconstruction material specimens. For each material, 10 specimens having a of 3.0 × 1.2 × 1.2 mm (length × width × height) were used. The stresses, strains, and elastic moduli of amalgam, dental ceramic, gold alloy, dental resin, zirconia, and titanium alloy were obtained from the compressive test. The hardness values of amalgam, dental ceramic, gold alloy, dental resin, zirconia, and titanium alloy were obtained from the references [14–19]. And, the stresses, strains, elastic moduli, and the hardness values of enamel and dentin were obtained from the reference [13]. The mechanical role of enamel is to crush food and protect dentin because of its higher wear resistance, and that of dentin is to absorb bite forces because of its higher force resistance. Therefore, the hardness value should be prioritized for enamel replacement materials, and mechanical properties should be prioritized for dentin replacement materials. Therefore, zirconia and titanium alloy were considered suitable tooth reconstruction materials for replacing enamel, and gold alloy, zirconia, and titanium alloy were considered suitable tooth reconstruction materials for replacing dentin. However, owing to the excessive mechanical properties and hardness values of zirconia and titanium alloy, these may show poor biocompatibility with natural teeth. Thus far, no tooth reconstruction material satisfies the requirements of having both a hardness value similar to that of enamel and mechanical properties similar to those of dentin.
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Fitri, Maida, and Kamizar Kamizar. "Esthetic Restoration of Enamel Hypoplasia: A Case Report." In 2nd Aceh International Dental Meeting 2021 (AIDEM 2021). Paris, France: Atlantis Press, 2022. http://dx.doi.org/10.2991/ahsr.k.220302.009.

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5

Perelman, Binjamin, and Vishal S. Sharma. "Assessing the Mechanical Properties of 3D Printed Bio-Inspired Structures and Integrating Them Into a Product." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-60675.

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Abstract The Honeycomb structure is one of the most common natural structures used in sandwich panel cores. The Enamel structure’s mechanical properties were compared to the Honeycomb structure’s mechanical properties to investigate if the Enamel structure can improve the compressive strength, stiffness and energy absorption capabilities of sandwich panel cores and potentially replace the common Honeycomb structure. Also, the optimal cellular configurations for the Honeycomb and Enamel structures were explored. Indeed, it was found the Enamel structure can potentially replace the Honeycomb structure and a wall thickness of 1.2 mm and a wall length/cell radius of 8.14 mm will maximize the natural structures mechanical properties. Furthermore, it was found that both the natural structures have good compressive strength. Therefore, the natural structures with their optimal cellular configurations were integrated into a novel automobile floor mat to ensure the mat possesses good compressive strength to resist failure or permanent deformation. Moreover, the novel automobile floor mat has a design feature that offers an efficient debris capturing and removal system that adds value to the automobile floor mat.
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Hilerio, I., and M. A. Barron. "Analysis of Dental Enamel Topography." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81938.

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One of the fields of active research in dentistry today is biomaterials replacing, which is expected to be increasingly more similar to human dental enamel. As these dental materials are exposed to the diverse degrading actions present in the oral environment, it is important to know its superficial topography, which is related to the existence of asperities on a smaller scale, responsible for the interaction between opposing bodies. In this work we try to characterize the superficial topography of the dental enamel and evaluating a sane tooth and another degraded by use, comparing the values of the texture SEM. The results indicate that the dental enamel presents a topographical profile with a symmetrical distribution, between peaks and valleys, relative to the parameters of amplitudes as well as to parameters of material concentrations. The values encountered for the amplitude and densities of peaks parameters are high. It was verified in the degraded tooth the existence of mechanisms of mechanical origin added to chemical reactions, producing a wear type called “chemical wear”. The existence of this phenomenon was identified by verification in the degraded tooth of the presence of more deep valleys in relation to the peaks. The abrasion mechanism, also present in this wear type, decreased significantly the amplitude of the peaks. The evaluation methodology via profilometry3D revealed potentially efficient for the characterization of superficial topography and by verification of the mechanisms of wear dental.
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Kroyer, T., F. Caspers, E. Metral, F. Zimmermann, F. J. Behler, J. C. Wendel, and P. Hellmold. "A new type of distributed enamel based clearing electrode." In 2007 IEEE Particle Accelerator Conference (PAC). IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4441124.

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Thompson, Van P., Stephen Kao, and Ivory Kirkpatrick. "The Tooth as a Basis for Biomimetic Design." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2663.

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Abstract Teeth are uniquely capable of withstanding high forces (>200 N) with small contact area (< 0.5 mm2) and a high number of fatigue cycles (> 107) with little evidence of damage. Yet the tooth is comprised of an outer very brittle, anisotropic, highly crystalline enamel layer supported by an inner soft, but tough dentin. These structures are joined by a small (appoximately 30 microns wide) transition zone called the dento-enamel junction (DEJ). The DEJ plays a critical role in transfer of stress across the layers of the tooth. How the enamel-dentin complex (EDC) comprised of these layers and the DEJ is able to withstand the high contact loads and high cycle fatigue is not well understood. An understanding of the interplay of the various components would serve as the basis for design of dental ceramic or resin based composite crowns capable of service lives approaching those on natural teeth. Current all ceramic crowns have high failure rates (1–5% per yr) on molar teeth and improved performance is required before CAD-CAM restorations can be successful.
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Rodrigues, F., A. P. Serro, and C. G. Figueiredo-Pina. "Study of the Impact of the Bleaching with 6 % H2O2 Solution on Teeth Wear." In BALTTRIB 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/balttrib.2015.30.

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This study aims to evaluate the effect of a 6 % hydrogen peroxide (H 2 O 2 ) solution, activated with UV-light, in colour, wear, microhardness and roughness of enamel surface. Five teeth were cut, polished and exposed to black tea solution to confer them a dark color. The specimens were tested before and after bleaching using a spectrophotometer colour equipment, a nanotribometer, a micro durometer and a SEM. On comparing with untreated, the treated enamel surface showed an improvement of colour but a reduction of microhardness and an increase of roughness and wear. A 6 % hydrogen peroxide solution, activated with UV-light, has capacity to induce alterations in enamel surface making it less hard and more susceptible to wear.
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Stoykova, Elena V., Dimitar G. Slavov, and Tzonko Uzunov. "Reflection of laser light from a human enamel-dentin structure." In 11th International School on Quantum Electronics: Laser Physics and Applications, edited by Peter A. Atanasov and Stefka Cartaleva. SPIE, 2001. http://dx.doi.org/10.1117/12.425178.

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Звіти організацій з теми "Enamel-A"

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Weiss, Charles, William McGinley, Bradford Songer, Madeline Kuchinski, and Frank Kuchinski. Performance of active porcelain enamel coated fibers for fiber-reinforced concrete : the performance of active porcelain enamel coatings for fiber-reinforced concrete and fiber tests at the University of Louisville. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40683.

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A patented active porcelain enamel coating improves both the bond between the concrete and steel reinforcement as well as its corrosion resistance. A Small Business Innovation Research (SBIR) program to develop a commercial method for production of porcelain-coated fibers was developed in 2015. Market potential of this technology with its steel/concrete bond improvements and corrosion protection suggests that it can compete with other fiber reinforcing systems, with improvements in performance, durability, and cost, especially as compared to smooth fibers incorporated into concrete slabs and beams. Preliminary testing in a Phase 1 SBIR investigation indicated that active ceramic coatings on small diameter wire significantly improved the bond between the wires and the concrete to the point that the wires achieved yield before pullout without affecting the strength of the wire. As part of an SBIR Phase 2 effort, the University of Louisville under contract for Ceramics, Composites and Coatings Inc., proposed an investigation to evaluate active enamel-coated steel fibers in typical concrete applications and in masonry grouts in both tension and compression. Evaluation of the effect of the incorporation of coated fibers into Ultra-High Performance Concrete (UHPC) was examined using flexural and compressive strength testing as well as through nanoindentation.
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Meza-Mauricio, Jonathan, Camila Furquim, Willy Bustillos, David Soto-Peñaloza, David Peñarrocha-Oltra, Belen Retamal-Valdes, and Marcelo Faveri. Does enamel matrix derivate application provide additional clinical benefits in the treatment of upper gingival recessions Class I and II of Miller? A systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, October 2020. http://dx.doi.org/10.37766/inplasy2020.10.0048.

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Ritto, Fernanda, Karen Tiwana, Zachary Dacus, Troy Schmitz, and João Vitor Canellas. Approaching different stages of the disease and the correlated treatment on Molar Incisor Hypomineralization (MIH): a systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2022. http://dx.doi.org/10.37766/inplasy2022.3.0127.

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Анотація:
Review question / Objective: This systematic review aims to define and evaluate the treatments available for two different stages of the Molar Incisor Hypomineralization (MIH) defect. On stage I, the lesion is classified as Mild and is characterized by demarcated opacities without posteruptive breakdown. On stage II, the lesion is classified as Severe and is characterized by posteruptive breakdown of enamel. To this end, the proposed study will answer the following question: What are the treatments available and their results for the two different stages of MIH on permanent teeth? Condition being studied: Mild and Severe Molar Incisor Hypomineralization (MIH). MIH is an enamel defect that occurs during the mineralization on the second stage of the formation of the enamel called maturation phase. This disease affects the outer layer of enamel, making the structure soft and undercalcified. The appearance of the lesion can be white opaque to yellow brown depending on the stage ( mild or severe).
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